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Repurchase Agreement Borrowings Repurchase Agreement Borrowings | 12 Months Ended
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Dec. 31, 2017
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Table Text Block] | Repurchase Agreement Borrowings Securities sold under agreements to repurchase ("repurchase agreements") with customers represent funds deposited by customers, generally on an overnight basis, that are collateralized by investment securities owned by Park. Repurchase agreements with customers are included in short-term borrowings on the Consolidated Balance Sheets. Park's repurchase agreements with a third-party financial institution are classified as long-term debt on the Consolidated Balance Sheets. All repurchase agreements are subject to the terms and conditions of repurchase/security agreements between Park and the client and are accounted for as secured borrowings. Park's repurchase agreements reflected in short-term borrowings consist of customer accounts and securities which are pledged on an individual security basis. At December 31, 2017 and December 31, 2016, Park's repurchase agreement borrowings totaled $183 million and $510 million, respectively. At December 31, 2016, $300 million of Park's repurchase agreement borrowings were classified as long-term debt, with the remaining amount being classified as short-term borrowings on the Consolidated Balance Sheets. At December 31, 2017, all repurchase agreements were classified as short-term borrowings. These borrowings were collateralized with U.S. government and agency securities with a fair value of $213 million and $569 million at December 31, 2017 and December 31, 2016, respectively. Declines in the value of the collateral would require Park to pledge additional securities. As of December 31, 2017 and December 31, 2016, Park had $975 million and $640 million, respectively, of available unpledged securities. The following table presents the carrying value of Park's repurchase agreements by remaining contractual maturity and collateral pledged at December 31, 2017 and December 31, 2016:
|  | December 31, 2017
(In thousands) |  | Remaining Contractual Maturity of the Agreements
|  | Overnight and Continuous |  | Up to 30 days |  | 30 - 90 days |  | Greater than 90 days |  | Total
U.S. government and agency securities |  | $ | 182,185 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,104 |  |  | $ | 183,289 |
|  | December 31, 2016
(In thousands) |  | Remaining Contractual Maturity of the Agreements
|  | Overnight and Continuous |  | Up to 30 days |  | 30 - 90 days |  | Greater than 90 days |  | Total
U.S. government and agency securities |  | $ | 208,691 |  |  | $ | — |  |  | $ | — |  |  | $ | 301,104 |  |  | $ | 509,795 |
See Note 13 - Short-Term Borrowings for additional information related to repurchase agreements classified as short-term borrowings.

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of the nature and risks of short-term collateralized financing obtained through repurchase agreements, securities lending transactions and repurchase-to-maturity transactions, accounted for as secured borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=64858031&loc=SL34722452-111729 + Details
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